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In PMR generally amine (NH2) and hydroxy (OH) proton/s do not couple with nearby proton/s and give singlet signals. But in some cases they couple with neighbouring protons and produce peak...
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In PMR study of aldehyde compounds, aldehydic proton shows generally singlet signal. Why it is not splitting according to neighbour hood protons? Aldehyde proton is not exchangable with solvent....
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